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Look up Transwiki:intelligibility in Wiktionary, the free dictionary.
See also Mutual intelligibility for the linguistic concept.

Intelligibility is for voice communications, the capability of being understood - the quality of language that is comprehensible; comprehensibility or understandability = the quality of comprehensible language or thought.

Intelligibility means clearness, explicitness, lucidity, comprehensibility, perspicuity, legibility, plain speaking, manifestation, precision. a word to the wise.

The degree to which speech can be understood. With specific reference to speech communication system specification and testing, intelligibility denotes the extent to which trained listeners can identify words or phrases that are spoken by trained talkers and transmitted to the listeners via the communication system.

Excess reverberation does affect speech intelligibility.

Note: Intelligibility does not imply the recognition of a particular voice.

Measured as Speech Transmission Index = STI or in Alcons in percent.

Quantity to be measured Unit of measurement Good values
%ALcons Articulation loss (popular in USA) < 10 %
C50 Clarity index (widespread in Germany) > 3 dB
STI (RASTI) Intelligibility (international known) > 0.6

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